The initial upper limit using a 32-tile prototype for MWA was set by [1]}. Their method employs a robust estimator that tracks error covariances and provides PS estimates using the k-modes in the EoR window. Using 128 tile MWA configuration, [2]} provided the upper limit between \(z\)  17.9 and 11.6 or \(\nu \)  75 & 113 MHz [2]} for 2 nights of observations. The systematic errors reported in [2]} were mitigated to a large extent in [5]}, and the techniques were employed to deep 32 hour integrated data, providing the upper limits at \(z=\) 7.1. [6]} further improved systematic conditions and observed effects, improving the PS limit using just 21 hours of data by almost an order of magnitude. Using the improved techniques developed in [6]} along with some additional quality checks, 40 hours of MWA Phase-II data was used to provide upper limits at \(z\)  6.5, 6.8, and 7.1 [8]}. A multi-redshift limit on the 21-cm PS over the range \(6.5\le z \le 8.7\)  was set by [9]}, using four seasons of observation from the MWA EoR project. Using \(\sim \) 300 hours of cleanest data from the combined set, they provided PS estimates over different fields, pointings, and redshift ranges. Recently, [10]} has also provided an upper limit on the 21-cm PS at \(z\sim \) 13-17, using 15 hours of MWA data. The different values of the lowest value of \(\Delta ^2(k)\)  provided by MWA so far have been tabulated in Table REF .
